Update to TypeScript 3.7 (#3275)

and update to prettier 1.19

Also, update `assert()` and remove not null assertions where possibly
in `cli`.

Closes #3273

2 files changed, 24 insertions, 29 deletions

diff --git a/std/util/async.ts b/std/util/async.ts
index 8c4823ad9..6e2db69dc 100644
--- a/std/util/async.ts
+++ b/std/util/async.ts
@@ -20,11 +20,9 @@ export interface Deferred<T> extends Promise<T> {
  */
 export function deferred<T>(): Deferred<T> {
   let methods;
-  const promise = new Promise<T>(
-    (resolve, reject): void => {
-      methods = { resolve, reject };
-    }
-  );
+  const promise = new Promise<T>((resolve, reject): void => {
+    methods = { resolve, reject };
+  });
   return Object.assign(promise, methods)! as Deferred<T>;
 }
 
@@ -111,10 +109,9 @@ export async function collectUint8Arrays(
 
 // Delays the given milliseconds and resolves.
 export function delay(ms: number): Promise<void> {
-  return new Promise(
-    (res): number =>
-      setTimeout((): void => {
-        res();
-      }, ms)
+  return new Promise((res): number =>
+    setTimeout((): void => {
+      res();
+    }, ms)
   );
 }
diff --git a/std/util/deep_assign.ts b/std/util/deep_assign.ts
index 1dfc00a5b..b1c9f9ac9 100644
--- a/std/util/deep_assign.ts
+++ b/std/util/deep_assign.ts
@@ -8,26 +8,24 @@ export function deepAssign(
     if (!source || typeof source !== `object`) {
       return;
     }
-    Object.entries(source).forEach(
-      ([key, value]: [string, unknown]): void => {
-        if (value instanceof Date) {
-          target[key] = new Date(value);
-          return;
-        }
-        if (!value || typeof value !== `object`) {
-          target[key] = value;
-          return;
-        }
-        if (Array.isArray(value)) {
-          target[key] = [];
-        }
-        // value is an Object
-        if (typeof target[key] !== `object` || !target[key]) {
-          target[key] = {};
-        }
-        deepAssign(target[key] as Record<string, unknown>, value!);
+    Object.entries(source).forEach(([key, value]: [string, unknown]): void => {
+      if (value instanceof Date) {
+        target[key] = new Date(value);
+        return;
       }
-    );
+      if (!value || typeof value !== `object`) {
+        target[key] = value;
+        return;
+      }
+      if (Array.isArray(value)) {
+        target[key] = [];
+      }
+      // value is an Object
+      if (typeof target[key] !== `object` || !target[key]) {
+        target[key] = {};
+      }
+      deepAssign(target[key] as Record<string, unknown>, value!);
+    });
   }
   return target;
 }